package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomerException;
import com.itheima.reggie.mapper.CategoryMapper;

import com.itheima.reggie.pojo.Category;

import com.itheima.reggie.pojo.Dish;
import com.itheima.reggie.pojo.Setmeal;
import com.itheima.reggie.service.CategoryService;

import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;


    // 根据id删除分类，删除之前需要进行判断
    @Override
    public void remove(Long id) {

        //添加查询条件，根据分类id进行查询菜品数据,Dish::getCategoryId是QueryWrapper.lambda()表达式简化书写
        LambdaQueryWrapper<Dish> queryWrapper1 = new LambdaQueryWrapper<>();
        queryWrapper1.eq(Dish::getCategoryId,id);
        int count1 = dishService.count(queryWrapper1);
        //如果已经关联，抛出一个业务异常
        if (count1 > 0) {
            throw new CustomerException("当前分类下关联了菜品，不能删除");//已经关联菜品，抛出一个业务异常
        }

        //查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> queryWrapper2 = new LambdaQueryWrapper<>();
        queryWrapper2.eq(Setmeal::getCategoryId, id);
        int count2 = setmealService.count(queryWrapper2);
        //如果已经关联，抛出一个业务异常
        if (count2 > 0) {
            throw new CustomerException("当前分类下关联了套餐，不能删除");//已经关联套餐，抛出一个业务异常
        }

        //正常删除分类
        this.removeById(id);
    }

    }
